Composite corrugated and solid fiber board



Jan. 31, -1 933.

P. F. BOEYE COMPOSITE CORRUGATED AND SOLID FIBER BOARD Original Filed March 7, 1927 2 Sheets-Sheet l Paul Z 'fiaeye *r WMWWW gmcnioz Jan. 31, 1933. P F BOEYE COMPOSITE CORRUGATED AND SOLID FIBER BOARD Original F l ar 1927 2 Sheets-Sheet 2 lalllllllldlllllllwl T I ......l .b 4,;

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Patented 31, 1933 UNITED STATES PATENT OFFICE PAUL l. BOEYE, OF ST. PAUL, MINNESOTA, ASSIGNOR TO WALDORF PAPEB PRODUCTS COMPANY, A CORPORATION OF MINNESOTA COMPOSITE CORRUGATED AND SOLID FIBER BOABD Original application iiled larch 7, 1927, serial lio. 178,484. Divided and this application iiled January I, 1931. Serial li o. 506,601.

In the manufacture of paper or straw board containers, in order to reduce the weight of the containersto a minimum, it has been common practice to use sheet material having a corrugated layer and at least one surface layer of plain board. Such corrugated board is cut and creased to form blanks of suitable size and shape and is then as- V lower cost of the securing operation.

provision must be made for reinforcing the ortions of such board through which the asteners are driven.

It is the object of the present invention to roduce economically a composite board havmg substantially the lightness of corrugated board and formed with solid portions adapted to securely hold wire staples or other metallic fasteners. The board of this invention may be made from sheets of paper or straw board, such as those commonly used in the construction of corrugated board, and

the greater part of the board is corrugated.

The portions of the board which are solid have the various layers of sheets secured together without substantial openings betweenthem, and' may be locate wherever the flanges or other parts to be secured are desire The invention will be best understood by reference to the accompanying drawings in which Figure 1 is an end view of my improved board; Fig. 2 is a plan view of a fragmentary portion of the same with one of the liner or surface sheets removed or omitted; Fig. 3 is a diagrammatic side elevation of a suitable machine for forming the board; Fig. 4: is a detail sectional view taken on the line 4-4 of Fig.3; Fig. 5 is a section taken on the line 55 of ig. 2; Fig. '6 is a fragmentary section taken on the line 6-6 of Fig. 1; Fi 7 is a planview of a part of the machine, s owing suitable means for compressing the corrugations and for solidifying portions of the sheet and Fig. 8 is a side elevation of said part of the machine.

As shown in Figs. 1, 2, 5 and 6, my im-' by adhesive. Solid portions 12 are formed to receive wire fasteners'or other securing means. These portions 12 may be constructed most economically in a machine like that hereinafter described, wherein adhesive is applied to limited strips between the liners and corrugated core and then these strips or portions of the board are compressed to form relatively thin, solid and tough portions, extending transverse the corrugations.

My improved method for constructing such composite board may be carried out to advantage in a machine of the type in wide use in the construction of well known forms of corrugated board. Such a machine to gether with my novel attachments to orm my improved board, is shown diagrammatr ically in Figs. 3, 4, 7 and 8. In this machine, the sheet for forming the corrugated core 9 is supplied from a roll 13, said sheet being fed continuously into the machine. This sheet passes over a suitable guide roller adjacent to a heating element 14, where the sheet is steamed preparatory to being corrugatedbetween a pair of corrugatin'g rolls 15. After passing between these rolls where it is cor rugated, the sheet 9 is passed around the periphery of a large drum 16 having a surface which is corrugated to correspond with the corrugations on the rolls 15 and is then delivered to a second drum 17. As the corrugated sheet 9 passes towards .the lower periphery of the drum 16, the outer extremities or convex tips of the corrugations receive a coat of adhesive from a roll 18, liquid adhesive being supplied to said roll from a trough 19.

The liner 11 is supplied from a roll 20 from which it is'carried over suitable guide rolldrum and the corrugated sheet exposed to receive adhesive from a roll 23. This roll 23 is supplied with liquid adhesivein the usual manner from a trough 24, being arranged to moisten only the projecting convex portions of the corrugations in the core 19.

The second surface sheet or liner 10 is sup- I plied from a roll 25 and passes thence over 30 are mounted upon a pipe 34 suitable guide rollers and a heated drum 26 to a roller 27, which delivers it to the upper periphery of the drum 17. Now the liner 10 is applied to the corrugated sheet 9 upon the convex surfaces previously moistened with adhesive from the roll 23. The assembled board then passes beneath a series of hot plates 28, against which it is held by the bristles of a series of brushes 29. Durin the passage of the sheet beneath the heated p ates 28, the adhesive is allowed to set and the continually moving sheet is finally delivered at the end of the machinewhere it may be cut into blanks of the desired size.

To form the solid portions 12 of the sheet, ll supply additional adhesive between the layers of these portions by means of nozzles 30 and 31 and then compress these portions by means of a series of bolts 32 operating in contact therewith and firmly pressed against the board by pressure bars 33. The nozzles adapted to supply liquid adhesive thereto under pressure... The nozzles 30 are so located and operated that they continuously spray adhesive upon limited strips or hands otthe sheet 11 before said sheet is applied to the corrugated sheet 9. The nozzles 31 are similarly supplied with liquid adhesive under pressure and are arranged to apply the same in a continuous film upon narrow portions of the corrugated sheet 9,on its side opposite to that to which the sheet 11 is applied. To the portions of the corrugated sheet supplied with adhesive from the nozzles 31, the second surface} sheet 10 is applied. Thus, additional quantities of adhesive are applied continu ously between the several sheets 9, 10 and 11. and only upon the limited portions thereof, which are later compressed under the ac tion of the belt 32.

As best shown in Figs. '3" and 8, the belts 32 are arranged beneath the longitudinal portions of the sheet which are to be compressed. Each belt is supported upon a pair of pulleys 35, said pulleys being, in turn, supported upon shafts 36 and 37, extending transverse the machine. The shaft 37 may be driven by a belt u on a pulley 38 to car the u per runs oi the belts 32 (which engage the sheet) in the direction of movement of the sheet and at the same speed therewith. A pressure bar 33 is mounted beneath each of the several upper runs of the belts 32 to press said runs against the portions of the sheet to be compressed. The pressure bars 33 are carried upon transverse members 39, which are adjustable vertically upon supporting screws 40. Longitudinal frame members 41 of the machine are perforated to receive the screws 40. Suitable nuts 42 threaded upon said screws are arranged to engage the frame members 41, being adapted to be manipulated to raise and lowe members 39 and pressure bars 33. In the spaces between the belt 32, the corrugated sheet is supported and firmly held in contact with the heated plates 28 by the series of brushes 29 which are mounted upon a table .43.

In operation, as will now be readily understood, the liner sheets 10 and 11 and the corrugated core 9 are continuously drawn-from the rolls 13, 20 and 25. The inner surface of the liner 11, along the strips of board to be solidified, is continuously supplied with adhesive from the nozzles 30 and the corrugated core on the opposite side of the sheet is similarly supplied with continuous films of adhesive from the nozzles 31. Subsequently, when the sheets have been brought together at the upper periphery of the drum 17, they are passed beneath the heated plates 28, where the portions 12 of the board are compressed and dried to retain their thin form. As the sheet passes beneath the heated plates 28, the pressure of the belts 32 crushes the corrugations alon the bands or strips previously supplied by the nozzles 30 and 31, with suflicient adhesive to retain the compressed form. Thus, within the portion 12 of the board, the surface sheets are glued in a continuous path to the liner to form thin, solid portions without substantial openings between the surface sheets. It will be evident that the finished sheet may be cut longitudinally along a line like that indicated by the numeral 44 in Fig. 2 to form two sheets, each having corrugated central portions and solid margins, adapted to securely hold metallic fastenings. These margins also greatly lengthen the board where it is used in the construction ot walls or as a support for plaster. Whenso used, the nails may be driven through the solid margins to secure the board to the frame work or studding of a building.

It will be noted that the board is formed continuously and may be produced as rapidly as ordinary corrugated board without the solid portions. Thus, the cost of the board does not greatly exceed that of corrugated board of common type. The belts'32 and nozzles 30 and 31 maybe located oppo= r the screws 40 carrying the i site any portion of the sheet where it is desired to locate the solid portions. By merely omitting the liner 11 and renderm the nozzles 30 inoperative, a sheet like that s own in Figs. 2 and 5 ma be formed.

The invention 0 this application is a division of my co-pending application, Serial No. 173,484, filed March 7, 1927, for method of making composite corrugated and solid 1 fiber board.

Having described my invention what I claim as new and desire to protect by Letters Patent is:

1. The combination in a board having substantially solid and corrugated portions, of a corrugated sheet and at least one plain sheet, a portionhaving said sheets secured together only along the adjacent convex tips of the corrugations and a relatively solid portion of substantial width extending continuously across a multi licity of the corrugations and having sai corrugated sheet compressed and secured in compressed relation to said plain sheet.

2. The combination in a board for use 1n the construction of boxes, said board having substantially solid and corrugated portions, of a corrugated sheet and at least one plain sheet disposed face to face, a portion having said sheets secured together only along the adjacent convex tips 0 the corrugations and a relatively thin and solid portion of substantial width having said corrugated sheet compressed and secured to substantially the entire inner surface of said plain sheet. a

3. A board for use in the construction of boxes, said board having a corrugated portion and a substantially solid portion com-'- 40 prising a corrugated sheet and a plain sheet disposed face to face, a portion of'said board having openings between said sheets and in which said sheets are secured together at the abutting convex portions of sai corru ated sheet and a relatively solid portion 0 the board, having the corrugations flattened and secured in flattened relation to a greater part of the surface of the plain sheet. 4. A board having-a corrugated portion and a substantially solid portion comprising a core having parallel corrugations therein and plain surface sheets,a relatively thick portion of said board having openin s between the surface sheets and core an said sheets secured to the adjacent convex portions of said corrugated core only and a relatively thin and solid portion of the board extending transverse said corrugations, the corrugations in said solid portions of the core being crushed and secured to substantially the entire inner surface of both surface sheets.

In testimony whereof, I have hereunto signed my name to this specification.

I PAUL F. BOEYE. 

